The Complete RMM Buying Guide for UK MSPs 2026

If you're managing more than a handful of devices, you need an RMM (Remote Monitoring and Management) platform. But the market is crowded: NinjaOne, Datto, Pulseway, ConnectWise, Atera, Aerie OS, and a dozen others all claim to be "the best."

This guide will help you cut through the noise. We'll cover:

1. What an RMM actually is (and what it's not)
2. What you should evaluate when choosing one
3. Common RMM categories (and which fits your business)
4. The decision framework to pick the right platform
5. Common mistakes to avoid

By the end, you'll know exactly what features matter, what trade-offs exist, and how to avoid expensive migration mistakes.

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What is an RMM? (And What It's Not)

What an RMM Does

An RMM platform gives you visibility and control over all your clients' devices — from a single dashboard.

Core capabilities:

• Inventory: See what devices you manage, hardware specs, OS versions, installed software
• Monitoring: Real-time alerts when CPU, memory, disk, network, or other metrics exceed thresholds
• Patching: Automatically apply Windows, third-party, and OS patches on a schedule
• Remote access: Control devices remotely (like TeamViewer, but integrated)
• Scripting: Execute commands and scripts across multiple devices at once
• Reporting: Document device health, compliance, security posture

What an RMM Is Not

An RMM is NOT:

• A ticketing system (though many RMMs integrate with ticketing). An RMM detects problems; a PSA tracks how you fix them.
• A CRM (though you might want one). An RMM manages devices; a CRM manages client relationships.
• A backup solution. An RMM doesn't back up data (though it might alert you to backup failure).
• A security tool. An RMM doesn't protect against viruses (though it might deploy antivirus). EDR is different — it detects advanced threats.
• A complete managed services platform. Many RMMs try to do everything, but you might be better off with a focused RMM + best-in-breed PSA, CRM, and security tools.

The RMM's Real Value

An RMM's value isn't in any single feature — it's in efficiency and visibility at scale.

Without an RMM:

• You rely on client reports to know about problems ("My computer is slow")
• You manually log into each device to check status
• Patching is manual (you call clients, they install updates)
• Documentation is scattered (what software is on which device?)

With an RMM:

• Problems are detected before clients report them (proactive monitoring)
• You see the entire fleet from one dashboard
• Patching is automatic (no client involvement)
• Complete inventory is always current
• You can enforce security policies at scale

Real-world impact: An MSP with an RMM can manage 50–100+ devices per technician. Without an RMM, it's maybe 10–15 devices per technician. That's why RMMs exist.

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The RMM Feature Checklist

Before comparing specific platforms, here's what to evaluate:

Monitoring and Alerting

Questions to ask:

• What metrics can you monitor? (CPU, memory, disk, network, processes, services, temperature, power status)
• How often does it update? (real-time, every 5 minutes, every 30 minutes?)
• Can you create custom alerts? (alerts based on multiple conditions, not just CPU > 80%)
• Can you group alerts by severity? (critical, warning, info)
• Can alerts be sent to Slack, Teams, email, or your PSA?

What matters: Real-time monitoring (sub-5-minute updates) is important for detecting and responding to incidents quickly.

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Patching

Questions to ask:

• Does it patch Windows OS, third-party apps, and drivers?
• Can you schedule patches to be installed automatically?
• Does it handle patches that require reboots? (Can you schedule reboot windows?)
• Does it report patch compliance by device or by client?
• Can it enforce patches on non-compliant devices?
• Does it handle WSUS integration for on-premises patches?

What matters: Automatic patching with reboot scheduling is essential. Manual patching doesn't scale beyond 20–30 devices.

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Inventory and Asset Management

Questions to ask:

• Does it collect hardware specs (CPU, RAM, disk, model)?
• Does it track installed software and versions?
• Can you search for devices by spec or software? (e.g., "all devices with < 4GB RAM" or "all devices with Office 365")
• Does it track network adapters, BIOS, drivers?
• Can you create custom fields for your own metadata?

What matters: A complete, searchable inventory is the foundation of proactive support and capacity planning.

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Remote Access

Questions to ask:

• Does it provide unattended remote access? (access without user approval)
• Can you provide attended remote access links to clients? (they click a link, you get access)
• Is the connection fast and responsive? (sub-200ms latency is important)
• Does it support file transfer between you and the device?
• Does it provide session recording for compliance?
• Does it handle firewalls and NAT without VPN setup?

What matters: Unattended remote access is essential. Attended access is nice-to-have for interactive support.

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Scripting and Automation

Questions to ask:

• What languages can you use? (PowerShell, Bash, Python, batch, VBScript)
• Can you run scripts on a schedule or via alert trigger?
• Can scripts run with admin or user privileges?
• Can you pass parameters to scripts and capture output?
• Does it provide a library of pre-built scripts?
• Can scripts be rolled back if something goes wrong?

What matters: PowerShell and Bash support with conditional execution is important. Pre-built scripts save time.

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Reporting

Questions to ask:

• Can you create custom reports? (device health, compliance, patch status)
• Can reports be scheduled and emailed to clients automatically?
• Can you export data for further analysis?
• Does it provide compliance reports? (GDPR, HIPAA, ISO 27001, etc.)
• Can you set up dashboards for different stakeholders? (technician view, manager view, client view)

What matters: Automated reporting to clients is important for retention and upselling. Compliance reporting is critical if you manage regulated clients.

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Integration with Other Tools

Questions to ask:

• Does it integrate with your PSA? (alert creation, ticket workflow)
• Does it integrate with your CRM? (client data synchronisation)
• Does it integrate with email, Slack, Teams?
• Can you integrate with third-party tools via API or webhook?
• Does it support single sign-on (SSO)?

What matters: Tight integration with your PSA saves enormous amounts of time. Loose integrations require manual work.

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Scalability

Questions to ask:

• How many devices can it manage? (1,000? 10,000? 100,000+?)
• How does it handle large deployments? (does performance degrade?)
• What's the per-device licensing cost at scale?
• Does it support multi-tenant? (managing devices for 10 clients separately)
• Does it handle geographically distributed networks?

What matters: Most MSPs don't need to manage 100,000 devices, but an RMM should scale smoothly as you grow.

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User Experience

Questions to ask:

• Is the interface intuitive or does it require extensive training?
• Does it have mobile apps for monitoring on-the-go?
• Can technicians quickly find what they need?
• Are there good documentation and community resources?
• How responsive is technical support?

What matters: Poor UX leads to frustrated technicians and slower response times. Test it with your team before committing.

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RMM Categories: Which One Is Right for You?

Category 1: Lightweight RMMs

Target: Solo technicians and very small MSPs (< 50 devices)

Characteristics:

• Simple, focused interface
• Affordable per-device cost (£0.50–3 per device)
• Covers core monitoring, patching, remote access
• Limited scripting and automation
• Usually RMM-only (no PSA, CRM, etc.)

Examples: Pulseway, Atera, N-able N-sight

Pros:

• Easy to learn and use
• Cheap to start
• Quick setup (hours, not days)

Cons:

• Limited as you grow (tool sprawl problem)
• Limited automation and customisation
• May require vendor lock-in for upgrades

Best for: Solo tech managing 10–50 devices, no immediate PSA/CRM needs

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Category 2: Mid-Market RMMs

Target: Growing MSPs (50–500 devices)

Characteristics:

• Comprehensive feature set (monitoring, patching, scripting, reporting)
• Integrated or tight partnership with PSA (ticketing)
• Per-device cost £2–8
• Good API for custom integrations
• Support for 500+ devices comfortably

Examples: Datto (formerly Autotask RMM), ConnectWise Automate, Syncro, Aerie OS

Pros:

• Feature-complete without overwhelming complexity
• Good PSA integration (if built-in or partner)
• Scales well with growing business
• Reasonable pricing for feature set

Cons:

• More complex than lightweight tools (longer training)
• Might include features you don't need
• Middle-tier pricing (not the cheapest)

Best for: Growing MSP (10–30 technicians), wants RMM + PSA integration, planning to scale

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Category 3: Enterprise RMMs

Target: Large MSPs, enterprises, global deployments

Characteristics:

• Extremely feature-rich (often overkill for small MSPs)
• Advanced security, compliance, and reporting
• Per-device cost £5–20+
• Extensive customisation and integration options
• Support for 10,000+ devices

Examples: NinjaOne, ConnectWise Automate (premium), Kaseya VSA, N-able N-central

Pros:

• Handles any scale
• Advanced reporting and compliance
• Excellent API and customisation
• Enterprise support and SLAs

Cons:

• Expensive (often £500–5,000+ per month base cost)
• Overkill for small MSPs (paying for features you won't use)
• Steeper learning curve
• Vendor lock-in can be heavy

Best for: Large MSP (50+ technicians), enterprise clients, heavily regulated industry

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The RMM Decision Framework

Use this framework to narrow your choices:

Step 1: Define Your MSP Profile

Dimension	Your Answer
Current device count	1–50 / 50–500 / 500–5,000 / 5,000+
Expected 3-year device count	Same brackets
Team size	1–2 / 3–10 / 10+ technicians
Current PSA/CRM	None / Spreadsheet / Existing tool
Compliance needs	None / GDPR / HIPAA / ISO 27001
Budget per device	£0–1 / £1–5 / £5–10 / £10+

Action: Answer these honestly. If you're a solo tech managing 30 devices, don't buy an enterprise RMM.

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Step 2: Define Your Must-Haves

Pick 3–5 non-negotiable features:

• Example: "Must integrate with HaloPSA," "Must support PowerShell scripting," "Must have real-time monitoring"

Action: Write these down. This eliminates 50% of options immediately.

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Step 3: Create a Comparison Matrix

Feature	Option A	Option B	Option C	Weight
Monitoring	Real-time	15-min update	Real-time	10
Patching	Auto + schedule	Manual scheduling	Auto only	8
PSA integration	Tight (same vendor)	API-based	None	9
Pricing (100 devices)	£400/month	£600/month	£200/month	8
Ease of use	Easy	Moderate	Complex	6

Action: Score each option (1–10) and weight by importance. This gives you an objective comparison.

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Step 4: Test Before Buying

Request a 30-day trial. Test it with:

• 5–10 of your own devices (if you're evaluating for clients, use your office)
• Real monitoring scenarios (set an alert threshold and trigger it manually)
• A script execution (patch check, inventory collection)
• Integration with your existing tools

Action: Have your team use it. If they hate it, you hate it.

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Step 5: Evaluate Vendor Stability and Support

Questions to ask:

• How long has this vendor been around?
• Are they profitable (or burning venture capital)?
• What's their support response time? (SLA: 4 hours, 24 hours, best-effort?)
• Do they have a community or user forum?
• How responsive are they to feature requests?

Action: Read recent reviews. Talk to current customers. Stability matters — a migration away from a dead or acquired vendor is expensive.

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Common Mistakes to Avoid

Mistake 1: Choosing Based on Price Alone

Why it's a mistake: Saving £50/month (£600/year) on RMM licensing can cost you £5,000+ in migration effort and lost productivity if you choose the wrong tool.

Example: You pick a cheap RMM that doesn't integrate with your PSA. You'll waste 5 hours/week creating tickets manually. That's £10,000+ per year in labour cost.

Lesson: Total cost of ownership (TCO) matters more than per-device cost.

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Mistake 2: Buying Enterprise When You Need Mid-Market

Why it's a mistake: Enterprise RMMs are expensive and complex. You pay for features you'll never use, and your team spends weeks learning an over-engineered system.

Example: You're a 5-person MSP. You buy NinjaOne because "it's industry standard." You spend 3 months configuring it, your team is frustrated, you're paying £2,000/month, and you could have used Aerie OS or Syncro for half the cost with 80% of the features.

Lesson: Match the tool to your scale, not to the industry's largest players.

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Mistake 3: Not Testing Integration

Why it's a mistake: An RMM that doesn't integrate smoothly with your PSA creates manual work that compounds daily.

Example: You buy an RMM with weak PSA integration. Alerts don't create tickets automatically. Your technician manually creates 20 tickets per day. That's 100 hours per month of wasted labour.

Lesson: Integration testing is non-negotiable. It's worth weeks of evaluation time.

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Mistake 4: Ignoring Reporting Capabilities

Why it's a mistake: You need reports for clients, management, and compliance. Poor reporting tools mean you can't demonstrate value or prove compliance.

Example: A client asks, "How's my security posture?" You have no RMM reports to show them. You spend 2 hours manually collecting data. Your competitor with automated reporting answers in 2 minutes and upsells a security service.

Lesson: Reporting is how you communicate value. Invest in a tool with good built-in reporting.

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Mistake 5: Not Planning for Growth

Why it's a mistake: You choose an RMM that works for 100 devices, then 18 months later you have 500 devices and you discover the RMM doesn't scale well.

Example: You pick a lightweight RMM. Two years later, you've hired 3 more technicians and doubled your device count. The RMM is slow, you've hit client limits, and you need to migrate. That's 6 months of lost time.

Lesson: Choose an RMM that will still work when you're 2–3x bigger.

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Evaluating Aerie OS as Your RMM

Aerie OS is a mid-market RMM designed for growing UK MSPs who want more than monitoring. We're honest about where we are: a newer platform with modern architecture rather than a decade-old incumbent. Here's what that means for you.

Aerie's Strengths

• Unified agent: One agent handles RMM, security, backup, and network monitoring (simpler than a multi-agent stack)
• Integrated PSA: Built-in ticketing system (no integration glue needed)
• CRM native: Sales pipeline and contract management built-in
• Powerful automation: ReactFlow workflows for business process automation
• UK-first: GDPR, UK data residency, UK-native compliance
• Transparent pricing: Per-technician model (predictable, not per-device scaling)
• Flexible: Works as RMM-only initially, scales to full platform

Aerie's Trade-offs

• Newer platform: Established players like ConnectWise and NinjaOne have larger plugin ecosystems and longer community libraries. We're building ours.
• Mid-market positioning: Not the cheapest (lightweight RMMs may be cheaper per device initially)
• Not for enterprise scale: Designed for 50–5,000 devices; if you need 100,000+, consider NinjaOne
• Requires embracing the platform: Best value if you use PSA and CRM; RMM-only customers don't see full value

When Aerie OS Is the Right Choice

Aerie OS is right if you:

• Are growing beyond solo tech (3+ technicians)
• Want PSA integration without integration glue (tight coupling, not API-based)
• Are UK or European (GDPR compliance native)
• Plan to use CRM and want revenue tracking per client
• Want a single platform to reduce context switching
• Value automation and workflows

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The RMM Buying Process: Timeline

Phase	Duration	Activity
Research & shortlist	1–2 weeks	Identify 3–5 options, read reviews
Demo & trial request	1 week	Request trials, watch demos
Hands-on testing	2–4 weeks	Test with your infrastructure
Reference calls	1 week	Talk to current customers
Final comparison	1 week	Score, decide, negotiate terms
Total	6–10 weeks

Real-world: Small MSPs often decide faster (2–4 weeks). Enterprise deployments take 2–3 months.

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FAQ: Choosing an RMM

Q: Should we choose an RMM based on what our competitors use?

A: No. Just because NinjaOne is "industry standard" doesn't mean it's right for you.

Your competitors might be overpaying, over-engineering, or locked into legacy contracts. Choose based on your needs, not theirs.

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Q: Can we start with a lightweight RMM and upgrade later?

A: Yes, but migration has costs.

Costs of migration:

• Time to export data and configure new RMM (40–100 hours)
• Downtime on clients' networks during agent rollout
• Team retraining (new interface, new workflows)
• Potential data loss (not all tools export equally well)

Recommendation: If you think you'll outgrow a lightweight RMM within 12 months, skip it and start with mid-market. Save the migration pain.

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Q: What happens if we choose the wrong RMM?

A: Migrations are possible but expensive.

Migration cost (100 devices): £3,000–8,000 in labour + vendor switching time

Prevention: Test thoroughly (30-day trial) and talk to current customers before buying.

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Q: How important is per-device cost?

A: Important, but not as important as TCO.

Example:

• RMM A: £3 per device (cheap)
• RMM B: £6 per device (expensive)
• Your setup: 200 devices, 1 PSA tool

Annual cost with RMM A:

• RMM: 200 × £3 × 12 = £7,200
• PSA (separate): £3,000
• Total: £10,200

Annual cost with RMM B (integrated PSA):

• RMM + integrated PSA: 200 × £6 × 12 = £14,400
• PSA (separate): £0
• Total: £14,400

BUT: RMM B saves 5 hours/week on integration = £13,000 in labour

Real TCO: RMM A costs £23,200; RMM B costs £14,400

Lesson: Sometimes paying more per device is cheaper overall.

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Conclusion

Choosing an RMM is one of the most important decisions you'll make as an MSP. The right tool drives efficiency, scales with you, and integrates with your other systems. The wrong tool wastes time, creates friction, and eventually forces you to migrate.

Here's your action plan:

1. Audit your current setup — What devices are you managing? What's your team size? What are your pain points?
2. Define your must-haves — What features can't you live without?
3. Shortlist 3–5 options — Research tools in your category (lightweight, mid-market, enterprise)
4. Test with trials — Spend time in each platform with your real infrastructure
5. Compare and score — Use a decision matrix to make an objective choice
6. Check references — Talk to current customers
7. Evaluate TCO — Not just per-device cost, but total cost including labour and integration
8. Make the decision — Pick the tool that fits your business, not the industry favourite

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Next Steps

Ready to find your ideal RMM?

• Explore Aerie OS RMM features — See how our unified agent handles monitoring, patching, and scripting
• Compare Aerie OS vs competitors — Side-by-side feature comparisons
• View transparent pricing — Per-technician model with no per-device surprises
• Book a demo — Talk through your specific setup and requirements